And louis



(No Model.) 2 sheetssheet 1'. S. R. LINVILLE, & L. F. HETTMAN-SPERGBR.

PRINTING TBLEGRAPH. No. 504.732. Patented Sept. 12, 1893.

/77- Tfr:

VV TA/ESSE 5*/ (No Model.) 2 Sheets-Sheet 2.

S. R. LINVILLE & L. F. EBTTMANSPERGER. PRINTING TELEGRAPH.

No. 504,732. Patented Sept. 12, 1893.

UNITED STATES PATENT OEEIGE SAMUEL RUSH LINVILLE, OE PHILADELPHIA, PENNSYLVANIA, AND LOUIS FREDERICK I-IETTMANSPERGER, OE CAMDEN, NEIV JERSEY, ASSIGNORS TO THE UNITED STATES PRINTING TELEGRAPI-I COMPANY, OE PHILA- DELPHIA, PENNSYLVANIA.

PRINTING-TELEGRAPH.

SPECIFCATION forming part of Letters Patent No. 504,732, dated September 12, 1893.

Application filed December 16,1892. Serial No. 455,353. (No model.)

To @ZZ whom t may concern: struments by type-Wheel and printing cir- Be it known that We, SAMUEL RUSH LIN- cuits in parallel or multiple arc to earthfrom o VILLE, residing at the city of Philadelphia, in one electrode of an electric generator, having the county of Philadelphia and State of Penuthe oth er electrode thereof connected to earth.

5 Sylvania, and LOUIS FREDERICK IIETTMAN- Our invention consists of a printing tele- SPERGER, residing at the city of Camden,in the graph provided with subscribers instruments, county of Camden and State of New Jersey, printing and type-Wheel circuits in parallel both citizens of theUnited States, have jointly to earth at the respective instruments 'and a invented certain new and useful Improvecentral station having devices and theircom- 1o ments in Printing-Telegraphs, of which the plemental circuits for controlling the pole following is a specification. changer and alternator and for effecting im- Ourinvention relatesin genera-l to improvepressions at the subscribers instruments. 6o ments in printing telegraph systems compris- Our invention further consists of a printing ing a central station and its complemental telegraph provided with normally closed par- 15 electrical and mechanical devices and receivallel printing circuits operating a relay deing and transmitting instruments located at vice by the depression of a transmitter key subscribers offices or residences and conto break alocalcircuitthroughapole-changer nected with the central station by means of device adapted to arrest the type-Wheels and suitable conductors, the various parts of the through an interrupting device adapted to 2o system being arranged for operation in such break and again close. the printing circuit, manner that convenient and rapid communiwhereby an impression is effected upon the cation between the subscribers is afforded. arrested type-Wheels. 7o A printing telegraph of the type above re- Our invention further consists in certain ferred to is illustrated and described in and details of construction of the printing pallet,

25 by the Letters Patent of the United States the shifting mechanism therefor, and the numbered 450,630, dated April 2l, 1891, and printing springs attached thereto, whereby granted to Samuel B. Linville and Louis E. the impressions are clearly given in straight I'Iettsmansperger, and in and by the Letters lines Without blurring, and the characters are Patent numbered 450,581, dated April 21, uniformly spaced; and our invention further 3o 189i, and granted to Samuel R. Linville. In consists of the improvements in printingtele- -both of these patents the type-Wheels are graphs hereinafter fully described and paradapted to be shifted axially through the inticularly pointed out in the claims. 8c tervention of special circuits and devices in For the sake of a better explanation of our order to cause both type-Wheels to print in invention and before giving a brief descrip- 35 the same line, and in the said Patent No. tion of the several views of the drawings and 450,631 the type-Wheel circuits are in parallel a detail description of the parts therein so that numerous circuits for separate altershown, it may be remarked that the instrunators may be derived from one electrical ments employed are each provided with tivo generator, and the printing circuits pass in type-Wheels rigidly attached to shafts that 4o series through the printing magnets of tivo are controlled by escape-wheels and escapeconnected receiving and transmitting instrument pallets actuated by means of magnets ments, so that the magnets controlling the and polarized armatures responding to alter- 9o pole-changer require separate generators for nating currents in parallel type-Wheel cireach alternator. Consequently the improvecuits which pass from the electrodes of the 45 ments embraced in our present invention regenerator at the central station through polelate more particularly to circuits and niechanging and alternating devices, thence to chanical and electrical devices controlled earth from oneterminalof the alternator, and through lines connecting two subscribers7 infrom the other terminal in parallel through the coils of the escapement magnets of each of two connected subscribers instruments to earth at said instruments. One of the typewheels of each instrument may have letters engraved upon its periphery and the other may have figures and fractions engraved upon its periphery, and the impressions are made from the respective type-wheels on a paper tape and in two parallel lines by shifting the printing pallet as m-ay be required. The

'printing circuits emanate from one electrode of the generator and pass in a single line through the coils of a unison magnet and a circuit interrupter adapted to momentarily break and then close the printing circuit to effect impressions, and after passing this interrupting device the circuit divides in parallel through the magnets of relay devices at the central station, and passes in normally closed parallel circuits th rough the respective printing magnets and the indicating devices and keys of two connected subscribers iustruments to earth. These printing circuits may be derived from the same generator as the type-wheel-circuits and in such case the resistances in the respective circuits must be balanced. However, the printing circuits may be connected to a separate generator. The printing circuits between two connected subscribers instruments are normally closed in parallel, so that only the branch circuit through the transmitting keys of the senders instrument can be manually broken by depressing one of said keys.

In order to electan impression at both instruments, use is made of an electro mechanical device adapted to momentarily break and thenV close the printing line at a point between its generator and its point of division into parallel circuits, so that the impressions may be taken at both instruments while the printing circuit is momentarily broken. This electro mechanical device is constituted and operated as follows: The two branch printing circuits pass respectively through the coils of two relays which close through their armature-levers and front contacts a local battery circuit through the coils of the pole-changer magnet. Either relay will break this local circuit when the branch of the parallel printing circuit through it is broken at a key, and the consequent reversal of the current of the type-wheel line circuit due to the breaking of the local circuit through the pole-changer magnet, will cause the alternator and typewheelsto be arrested, as is fully set forth in the Patent No. 450,631 hereinbetore cited. The magnet of the circuit interrupting device may be included in the local circuit with the polechanger magnet, so that the pole-changer is operated to arrest the type-wheels and the interruptor is actuated to momentarily break and then close the printingline between the generator and the point at which the printing line diverges in parallel circuits, wherehyimpressions are taken at the arrested typewheels of the subscribers instruments in con` Vsunflower indicator L.

sequence of the momentary interruption of the parallel printing circuits.

The nature, scope and characteristic features of our invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof, and in which- Figure l, is a diagrammatic View illustrating a printing telegraph embodying features Aof our invention, and showing a central station provided with generators, an alternator, a pole-changer, relays, a printing line interrupter and terminals, and showing two subscribers instruments adapted to be connected at said terminals, and also showingcomplete circuits for operating the same. Fig. 2, is a perspective view illustrating the principal parts of a tape-printer and showing the sunflower indicator, the escapement devices, unison devices and printing devices embodying features of our invention. Fig. 3, is a detail elevational view partly in section showing the type-wheels, printing pallet-lever, printing pallet, devices for shifting the printing pallet and springs for causing the type-wheels to print singly. Fig. 4, is a side elevational view ot' the printing pallet-lever, showing the pallet guide box, pallet-block and printing pallet, and also showing the paper feeding and guiding devices embodying features of our invention. Fig. 5, is a detached plan view of the pallet guide-box, pallet-block and printing pallet, showing springs for controlling the pallet-block and a rod for shifting the latter; and Fig. 6, is a top or plan view of Fig. 4 with certain of the devices for guiding the paper tape omitted.

Referring now more particularly to Fig. 2, the escapement magnets M and M2, when energized by alternating currents in a manner hereinafter fully described, vibrate a polarized armature m4, attached to one end of an armature lever m2, pivotally supported by means of trunnions m3, and provided at the other extremity thereof with pallets m that co-operate with an escape-wheel m, and thereby control the step by step rotation of the type-wheel shaft nto. The number of teeth IOC) IIO

on the escape-wheel m, is equal to one half Y the number of divisions or characters of the type-wheel. Consequently the type-wheel is advanced one division or character at each reversalofcurrentinthetype-wheelline,itbeing understood that the type-wheel shaft w10, is driven through the intervention of any suitable power appliance, not shown. L,is a su ntlowerindicator rigidly attached to the framework of the machine, not shown, and provided with a circular series of insulated segmental contacts Z3, disposed concentrically in respect to the type-wheelshaft nio. AtrailerZ2, mounted on an arm Z4, carried by a hub Z5, secured to and insulated from the type-wheel shaft uw, sweeps over the insulated segments Z3, of the Z, is a hub also secured to and insulated from the type-wheel shaft m40, and arranged in electrical connecenligne e tion with the hub Z,is an insulated spring that bears on the periphery of the hub l. The circuit connections for the spring l, and sunflower indicator L, as well as the circuits for the whole apparatus will be hereinafter described with special reference to Fig. l w23, is a unison spiral rigidly mounted on the type-wheel shaft w40, and 7722, is a pivotally supported unison-latch that terminates in a pin working in the spiral groove of the unison-spiral 7123. The armaturenl'f', of the printing magnet N2, is attached to a lever als, oonnected by a link 7l, with a lever or arm m23, rigidly attached to and projecting radially from a shaft 7114. This lever or arm 712s, is provided with a right angular projection 7124, disposed in range of the unison latch 7222, and adapted to lift the same out of engagement with the unison-spiral 77..23 every time the magnet N2, is demagnetized, it being understood that the lever or arm 7223, moves upward under the influence of a spring uw, hereinafter more fully described. On the shaft H44, are also rigidly mounted the shifting-lever w24, and the pallet-levers 7L4 and 77,5. The free eX- tremity of the shifting-lever 77,24, is provided with a bent-arm p25, to which is pivoted a T- lever 7f3, forked at its lower extremity so as to engage a pin n3, projecting from the shifting-bar as. 7tlg, is an arm depending from the shifting-lever 71.21', and provided with an aperture, in which one extremityof the shifting-bar 7b3, is atforded freedom of endwise play. 71.45, is an arm depending from the lever W24, and connected with the retracting spring al, which causes the printing-pallet to make an impression whenever the circuit through the magnet N2, is interrupted. The shifting-bar a3, passes through the palletblock N, and is rigidly secured thereto. 7128 and 71729, 7748 and a4 are stops secured to the shifting-bar 713, and adapted to limit its range of movement. 7W and 7127, are collars orhubs mounted on the type-wheel shaft am, and provided with projecting pins 72.44 and m42, Fig. 3, whereof one 77.41, corresponds with the unison position of the type-wheels and the other n with the second position in advance of the unison position. The periphery of thetypewheel N4, is provided with letters of the alphabet, punctuation marks, blanks, the., not shown, and the periphery of the type-wheel N3, is provided with numerals, fractions, conventional signs, dsc., not shown. The demagnetization of the magnet N2, at the unison position of the type-wheels permits the T-lever, moving upward under the influence of the spring 714, to impinge upon the pin 7t44, whereby the printing-pallet 7144, is shifted directly beneath the type-wheel N4, and the demagnetizalion of the magnet N2, at the second position of the type-wheels in advance of the unison position permits the T-lever moving under the inlluenoe of the spring uw, to impinge upon the pin '7l-42, whereby the printingpallet 7144, is brought directly beneath the type-wheel N3, and an impression is of course taken from the respective type-wheels at every break in the circuit of the printing line. Therefore, when the type-wheels have been arrested at the unison position and the pallet levers are actuated, the printing pallet will be shifted into position to print from the letter type-wheel in one continuous line near one edge of the paper or tape, and when the type-wheels have been arrested at the second position after the unisoning of the instrument, thepallet levers are then actuated, the printing pallet is shifted into position to print from the ligure type-wheel in a contiuons line parallel to the letter line and near the other edge of the paper or tape. It will be understood that when printing figures, if the printing pallet is actuated at the unison position of the type-wheels, said pallet will be shifted into the position to print letters.

It may be remarked that the novel details comprising part of our invention and illustrated in Figs. e to 6 inclusive, relate more particularly to apparatus for effecting impressions from two type-wheels, and Willnow be described. On the pallet-levers 714 au d 77,5, is rigidly secured a guide-box n2, in which the pallet block N, is permitted to slide transversely of and directly beneath the typewheels. lt should be borne in mind that the shifting-bar n3, that carries the pallet-block N, passes through and works freely in slots in the side walls of the guide-box 7b2. The printing-pallet 7t44, is lirml y secured to the pallet-block N, and consequently moves with it. The paper tape N', passes between guidepins 7137, under a pin a3, over the pallet 77,44, and through an axially slotted pin n35, and then between the pressure-roll 77.12, andthe flanged feed-roll nu. 7%', are twin springs secured to each side of the pallet block N. The Shanks of these springs are bentor curved outward around the edges of the paper tape N', Fig. 3, thus allowing clearance at each side of the tape to permit of the shifting of the block N, without moving the paper tape laterally, and the extremities of these springs are bent inward over and above the paper-tape, Fig. 3, in such manner that a space is afforded between their adjacent extremities, foi-permitting the pallet 77.44, to pass between them,A

whenever it is effecting an impression. TWhen the printing-block N, has been shifted into position for bringing the pallet 7r4'4, under the type-wheel N3, the pins n30, moving under the influence of the springs 7W, fastened to the guide-box 712, drop into indentations 77.33, in the printing block, and when the printing block N, has been shifted into position for bringing the pallet 7r44, under the type-wheel N2, the pins 77.34, moving under the influence of the springs 77.242, drop into indentations 7%34, in the printing block, so that accidental lateral movements of the pallet 7244, while impressions are being taken by it from the typewheel under which it has been shifted, are prevented. 7am, is a feed roll revolubly mounted upon a pin projectingfrom the face plate of the instrument, not shown, and provided with a feed ratchet-wheel fas, and with Va counter ratchet-wheel nl, rigidly secured thereto. 12,7, is a pawl pivotally mounted uponV the curved extremity a6, of the pallet-lever 97,5, and held in engagement with the ratchetwheel ns, by means of a spring 01,45, engaging a projection on the pawl 97,7, Fig. 4. A pawl n, is rigidly secured to the pallet-leverfa5, and is adapted to engage the teeth of the counter ratchet-Wheel n10. When the circuit is broken through the printing magnet N2, the printing pallet n, moving under the iniiuonce of the spring n, strikes the paper tape N', the pawl 77,7, slips over a tooth of the ratchet-wheel ns into position for feeding the latter, and the pawl m9, clears the teeth of the counter ratchet-wheel nl". When the circuit is closed through the magnet N2, it attracts its armature 71,19, thus shifting the Ypallet-levers 171,4 and a5, downward and causing the pawl nl, to rotate Vthe Vratchet-wheel ns, and feed-roll n, whereupon'the pawl n, engages the counter ratchet-wheel n10, and thus checks and limits the rotary motion of the feed-roll nu. It may be remarked that the springs n' and u32 andY their accessories, as well as the Yfeeding devices hereinabove last described, operate with positive certainty to elfec'tually prevent blurring of the impressions and to feed the paper tape in such manner that regular spaces of uniform length occur between the words and letters.

The operation'of printing by means of the instruments hereinabove described and through the instrumentality of parallel printing and type-wheel circuits will now be explained with special reference to Fig. 1. One terminal e', of a generator E, which may be a compound wound dynamo machine, as shown, with a shunt resistance E2, interposed between its leads, is connected by a conductor l to one spring f, of a pole-changer F', and the other terminal e, of said generator is connected by a conductor l, to the other spring f', of the pole-changer F'; thence the typewheel circuit is through the back-stops f2 or f3 and conductor 2, to the insulated springs c' and c3, of an alternator C. The lever f5, of the pole-changer F', is connected by a conduct-or 2n to the springs c2 and c4, of the alternator O. The contacts c7 and o8, of the alternator C, are insulated from the shaft a', and from the contacts c11 and cl2, but are in electrical connection with the hub o9, and the contacts c11 and cl2, are in electrical connection with the hub om. The terminal spring c6, of the alternator C, is connected to earth by a conductor 3, and the terminal spring c5, of the alternator C, is connected to line through a conductor el, magnets G, of the polarized relay, and conductor 5, to the terminal block K. T, is a local battery that alternately energizes the magnets B and B', when the circuits lO and ll thereof, are al-l ternately closed at the stops g and g2, by the vibration of the tongue g' of the polarized relay G. These magnets B and B', vibrate an escapement-lever b2, which controls the step by step movementV of the escape-wheel b, mounted on the shaft a', of the alternator. When a plug Z134, is inserted in the aperture Zo', of the terminal block K, and a plug Z55, is inserted inthe aperture 707, the type-wheel circuitsY are in parallel from the terminal block K, through conductors 6, to the escapement Vmagnets M and M2, of two communieating subscribers instruments. These typewheel circuits then pass through the coils of the magnets M' and M2, of the respective instruments in reverse direction and thence to earth by conductors 7. It may be remarked that in practice the resistancescf the branch type-wheelcircuits must be equalized to give equal strength of current to the respective instruments. Moreover, by Vmaking the Aresistance of the printing circuits, to be presently described, equal to the resistance of the typewheel circuits, one generator may be employed to furnish currents for both circuits, and numerous other alternators, 'pole-changers, terminal station apparatus and terminal blocks may be included in multiple arc circuits and many instruments may be operated thereby at the same time through the instrumentality of currents through multiple arc circuits from one generator.

In Fig. l Vof the accompanying drawingsa separateV generator E', for the printing circuits, is shown. However the printing circuits themselves are the same as if they were derived from one terminal of the generator E, and will now be described. E3, is an outside shunt resistance interposed between the leads of the generator E. The terminal e3, of this generator E', is connected to earth at the generator, and the terminal e2, is connected by a conductor 20, to the unison magnet D, thence through its coils and by a conductor 2l to the insulated spring t', of an interrupter, through one of the radial metallic contacts i and hub i2, mounted on and insulated from the shaft is, thence by a spring Z3, and conductor 22, to the relay magnets H and H', through the coils of which the circuit divides in parallel and continues by two separate conductors 23 to the separate terminal blocks las and 7a2. printing line of the subscribers instrument shown at the left hand side of Fig. l, is inserted in an aperture in the terminal block Zes, and a plug 706, terminating the printing line of the subscribers communicating instruments, shown at the right hand side of Fig. l, is inserted in an aperture in the terminal block 7a2, the printing circuits continue in parallel by conductors 25, to the printing magnets N2, and through the coils of the same, by conductors 2G, to insulated springs Z, to hubs Z', to trailers Zg and to segments Z3, by conductors 27 to keys 02 and metallic bars 03, and thence by conductors 28 to earth. T', is a local battery which through the circuits 30, 3l, 32 and 33, energizcs the interrupter IIO lVhen a plug 7a3, terminating the magnet l, and also the pole-changer magnet F, when both the relay magnets H and H', are simultaneously energized by the printing line parallel circuits, thus causing the levers 7i and h6, to contact with the front stops 7b2 and h5, but the circuitof the local battery T', is interrupted when either the lever lt or lever h6, falls away from its front stop under the influence of its retracting spring in consequence of the interruption of the circuit in one of the parallel printing lines. It may be remarked that the resistances E2 and E3, are inserted between the leads ot the dynamo E and E', to preventa break of circuit through the iield magnets when the line circuit is interrupted and that incandescent lamps may be conveniently employed for this purpose. lVhen the circuit of the local battery T', is closed the armature f4, of the pole-changer, is attracted to its magnet, and the type-wheel line circuit-s through the alternator O, are in such direction in consequence of its connections through the pole-changer, that the alternator shaft a', is permitted to revolve automaticallyin consequence of the continuous alternation of current, and by reason of the fact that the pulley A, on the shaft a', is solicited by a suitable power appliance, not shown. At the same time the armature il, ot' the interrupter is attracted by the magnet l, energized by the current of the closed circuit of the local battery T'. XVhen the circuit of the local battery T', is interrupted, the magnet of the pole-changer is demagnetized and consequently the pole-changer moving under the influence of its retractingspring suddenly changes the direction of the currentthrough the alternator C, and polarized-relay G, whereupon the tongue g', of the relay G, immediately ceases to vibrate, so that the armature b3, of the pallet-lever b2, is permanently attracted by one of the magnets B and B', thereby causing the pallet-lever b2, to hold the escape-wheel l), and consequently arrest the alternator. At the same time the magnet l, of the interrupter, is demagnetized and the lever i, moving under the inliuence of its retracting springt, causes the pawl i5, to engage the ratchet-wheel i4, and thus rotate the shaft is, and radial contacts i', of the interrupter. This movement of the shaftt's, and parts connected therewith, causes the spring t', to ride from one radial contact t', across the intervening insulating material and to the next radial contact, thus temporarily breaking and again closing the circuit of the printing line between the terminal c2, of the generator E', and the dividing point of the circuit to the relays H and H', so that the interruptions that occur between the contacts 1", of the interrupter, serve to interrupt the parallel printing circuits. lVhen the type-wheels are running tlie parallel printing circuits are in closed circuit through the sunflowers and keys of com municating instruments,and the palletlevers n* and 11,5, and pallets n, are held away from the type wheels by the magnets N2. At

the instrument employed for sending messages to a communicating instrument, a key o', may be depressed in the usual manner. The depression of this key breaks at the contact 03, one branch of the closed printing circuit through one of the relay magnets H orH'. This demagnetization ot' the relay magnets H or H' interrupts the local circuit of the battery T', thus causing the pole changer magnet- F, to suddenly arrest the type-Wheels of both instrumen ts, whereupon theinterrupter, by reason of the break in the circuit of the local battery T', breaks temporarily the main printing circuit 20, from the terminal e2, of the generator E'. During this interval, the printing magnets N2, are demagnetized at both communicating instruments, and the springs am, cause the printing pallets it, to make the impression ot' the character indicated by the key depressed at the sending instrument. The unison latch d, of the alternator, is released every time the magnet D, is demagnetized by the interruption of the circuit of the printing line, and the unison latches w22, of communicating instruments are released every time the magnets N2, are demagnetized. lVhen no key is depressed, the type-wheels of both connected instruments are automatically run to unison by pulsations in line, and the alternator, making one more revolution than the type-wheels, is arrested in unison with the type-wheels. While a key o', remains depressed, the circuit of the local battery T', cannot close, because a branch line through one of the magnets H or H', is broken. However, the typewheels of both instruments will start as soon as both branch printing lines have been closed, and the pole-changer has reversed the direction of the current in the type-wheel circuit through the alternator and polarized relay.

It may be remarked that in sending a message, another key should be depressed before the previously depressed key has been released, in order to prevent the suniiower trailer Z2, Jfrom passing over a segment Z3, indicating the next character to be printed before the key connected with that segment has been depressed. At unison position the printing-pallet n.44, is normally under the typewheel N4, or will be shifted into that position by the pin n, and T-lever 1138, before the pallet n, causes the paper tape to strike the type-wheel. A blank space used for spacing between words is located at the unison position ot the type-Wheels. At the second division after unison, the T-lever n.35, will strike the pin w42, and shift the printing pallet under the type-wheel N3, as soon as the printing magnet N2, is demagnetized.

It may be remarked that other printing circuits in multiple arc, maybe derived from the generator E', and used for energizing other systems of relay magnets H and H', and for aitording other terminals la' and k2, that may be employed for other communicating ICO TIO

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instruments, and it maybe further remarked that by employinglines of equal resistance the system of alternators, polarized relays, polechangers, relays and interrupters maybe reduplicated to any desired extent, and all of these devices may be supplied with current 1n multiple are from one or more generators, so as to furnish idle terminals, by means of which it is possible to connect, as required, the numerous lines radiating from one general exchange to a great number of sub` scribers instruments. In this connection use may be made of the apparatus for and methods of signaling fullyillustrated and described 1n the Letters Patent of the United States No. 450,631, and hereinabove referred to.

Obviously our invention is not limited to the employment of the speeilic devices shown and described for interrupting and again closing the printing circuits, because modifications may be readily made in the same; nor do We limit ourselves to any specific number of generators, because the employment of one or more generators is Wit-hin the scope of our invention. Furthermore, our invention. is not limited to the employment of printing instruments designed for use as stock printers, because our novel controlling devices and circuits may be employed to operate page printers, and also tape printers of numerous type, provided the circuits actuating the same are controlled by alternators and printing circuit devices located at an exchange station.

Having thus described the nature and objects of our invention, what We claim as new, and desire to secure by Letters Patent, is-

l. An exchange system of printing telegraphy comprising subscribers instruments, printing and type-Wheel circuits in parallel to earth at the respective instruments and a central station having devices and their complemental circuits for controlling the polechanger and alternator and for effecting impressions at the subscribers7 instruments, substantially as and for the purposes set forth.

2. In an exchange systemof printing telegraphy, normally closed parallel printing circuits, a relay, a transmitting instrument, a local circuit, a pole changer, an interrupting device, and said printing circuits adapted to operate said relay bythe depression of a key of the transmitting instrument or instruments to break the local circuit through the pole changer device adapted to arrest the type- Wheels of the instrument or instruments and through the interrupting device to break and again close the said printing circuit for effecting an impression from the arrested type- Wheels, substantially as set forth.

3. In an exchange system of printing telegraphy, an electric generator, an alternator and its complemental pole-changer in a type Wheel line circuit from the generator, an escapement, escapement-magnets located in a local circuit and controlling the rotation of the alternator, a polarized-relay controlling the local circuit, a line from one terminal of said alternator to earth, a line from the other terminal ot the alternator to a terminal block at an exchange orcentral station through said polarized relay, communicating subscribers instruments provided with type-Wheels and their complemental polarized escapement armatureand escapement magnets, sunflowerindicators and keys and with printing magnets, type-Wheel circuits in parallel from said terminal block to earth through said escapement magnets, and printing circuits in parallel through the sunflower indicators, keys and printing magnets of the communicating instruments, substantially as described.

et. In an exchange system of printing telegraphy, a central station provided with a generator and with mechanical and electrical devices and their accessories for alternating and reversing the current in a type-wheel line leading to terminals at said station,subscrib ers instruments, type-Wheel circuits in parallel from said terminal to earth through the escapement magnets of said communicating instruments and printing circuits in parallel through the indicators, keys and printing magnets of said communicating instruments, substantially as and for the purposes set forth.

5. In an exchange system of printing telegraphy, a central station provided with an electric generator and with mechanical and electrical devices including an alternator for alternating and a pole-changer for reversing the current in a type-wheel line connected with one terminal of the alternator and leading to a terminal block, a line from the other terminal of the alternator to earth, communicating subscribers instruments provided with type-wheels and their complemental polarized escapement armatures and escapement magnets, suntiowerindicators, keys and printing magnets, type Wheel circuits in parallel from said terminal block to earth through said escapement magnets, and printing circuits in parallel through the indicators, keys and printing magnets of the communicating instruments, substantially as described.

6. In an exchange system ot printing teleg raphy,an electric generator, a poleehanger and its magnet, a circuit interrupter and its magnet adapted to momentarily break and close a printing circuit, an alternator and its unison magnet and controlling devices, a local battery circuit through said pole-changer magnet and interrupter magnet, two neutral relays adapted to close at their front contacts the circuit of said local battery and either relay adapted to break said local circuit, communicating instruments having sunflower int dicators, escapements, type-Wheel keys, and printing magnets and devices, type-Wheel circuits in parallel, and a printing line circuit from one electrode of said generator through the contacts of said interrupter, thence in parallel through each of the magnets of said relays, sunflower indicators, printing magnets and keys of the communi- IOO IIC

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eating instruments to earth, the arrangement being such that a break in either branch of the parallel printing circuits at a depressed key breaks the local circuit and arrests the alternator and the type-wheels of the communicating instruments and momentarily breaks and again closes the printing line circuits, thereby effecting impressions from the type-Wheels of communicating instruments.

7. ln an exchange system of printing telegraphy, an electric generator, a type-wheel line in parallel, mechanical and electrical devices controlled by a pole-changer adapted to arrest the type-Wheels, a local battery circuit through the magnets of said pole-changer, tivo relays adapted to close at their front contacts the circuit of said local battery and either relay adapted to break said local circuit, an interrupter interposed in said local circuit and adapted to momentarily break and close a printing line circuit in parallel through the magnets of said relays and thence through the keys and magnets of communicating instruments to earth, the arrangement being such that a break in either branch ofthe parallel printing circuits at a depressed key arrests the type-Wheels of communicatin instruments and momentarily breaks and again closes the printing line circuit, thereby effecting impressions at the communicating instruments during a break of circuit.

S. ln an exchange system of printing telegraphy, a type-wheel line and its accessories in parallel, a printingline and its accessories in parallel, a local battery circuit and its accessories for causing the type-Wheel line to arrest the type-wheels, two relays adapted to close at their front contacts the circuit of said local battery and either relay adapted to break said local circuit and an interrupter interposed in thelocal circuit and adapted to momentarily break and close the printing circuit before it divides in parallel, the arrangement being such that a break in either branch of the parallel printing circuits arrests the type-Wheels of communicating instruments and momentarily breaks and again closes the printing line circuits, thereby effecting impressions at the communicatinginstruments.

9. In an exchange system of printing telegraphy, a central or exchange station provided with an automatically controlled alternator, unison and pole-changing devices, an interrupter having its contacts in .the undivided portion of the printing circuitfrom one electrode of a generator and With relays controlling the interrupter and located in the divided portion of the printing circuits, and communicating subscribers instruments provided with indicators and keys interposed in said divided portion of the printing circuits and With connections for conveying said circuits to earth at said instruments, substantially as and for the purpose set forth.

l0. In an exchange system of printing telegraphy, a central station provided with an interrupter havingits contacts in the undivided portion of the printing circuits and with relays controlling the interrupter and interposed in the divided portion of the printing circuits, and communicatinginstruments provided With indicators and keys and printing magnets interposed in said divided portion of the printing circuits, substantially as and for the purposes set forth.

ll. ln an exchange system of printing telegraphy, an automatically controlled alternator, unison and pole-changing devices, the interrupter having its contacts in an undivided portion of the printing circuits from one electrode of a generator, and relays in the divided portion of the printing circuits from said electrode and communicating instruments provided with indicators and keys interposed in said divided portion of the printing circuits, substantially as and for the pur: )oses set forth.

l2. ln an exchange system of printing telegraph y, an automatically controlled alternator, unison, pole-changing and interrupting devices and their magnets and line contacts, a printing circuit from one electrode of an electric generator through the contacts of said interrupter, neutral relays in each of two subdivisions of said printing circuit, a local battery circuit through the levers and stops of said relays and the magnets of said interrupter and pole-changer, and communicating instruments provided with indicators, keys and printing magnets and devices located in said divided circuit, the construction and arrangement being such that the depression of a key dcmagnetizes said pole changer magnet and reverses said pole-changer, interrupts and closes said printing circuit, and effects impressions on two communicating instruments, substantially as and for the purposes set forth.

l5. In an exchange system of printing telegraphy, an automatically controlled alternator and its accessories for reversing and alternating the current, a type-wheel line, an interrupter and its magnets, a single printing circuit through the contacts of said interrupter, neutral relays in each of two sub-divisions of said single printing` circuit, a local battery circuit through the levers and stops of said relays and the magnets of said interrupter, and communicating instruments provided with indicators, keys and printing magnets and devices in said divided circuit, the construction and arrangement being such that the depression of a key reverses said polechanger, interrupts and closes said single circuit and effects impressions on two communicating instruments during the interruption of said circuit, substantially as and for the purposes set forth.

14. In an exchange system of printing telegraphy, a pole-changer and its accessories, an interrupter, a single circuit from one electrode of an electrical generator through the contacts of said interrupter, neutral relays in each of two sub-divisions of said single cir- IOO IIO

cuit, alocal battery circuit through the levers ing instruments having 'WPG-Wheels escape" and stops of said relays and the magnets of said interrupter and pole-changer, and coinmunicating instruments having their keys and printing magnets and devices in said divided circuit, the construction and arrangement being such that the depression of a key reverses said pole-changer, interrupts and closes said single circuit'and eifects impressions at two communicating instruments during the interruption of said circuit, substantially as and for the purposes set forth.

15. In a doublevline exchange system of printing telegraphy, electric generators, alternators and controlling devices at an exchange station, type-wheel lines in parallel from said alternator to communicating instruments, and printing lines in parallel from one electrode of an exchange generator to said instruments, substantially as and for the purposes set forth.

16. In a double line exchange system of printing telegraphy, elect-ric generators, alternators and controlling devices at an exchange station, type-wheel circuits to said alternator and thence to ground and in parallel to Vcommunicating instruments, and printing lines in parallel from one electrode of an exchange generator to said instruments, substantially as and for the purposes set forth.

17. In a double line exchange system of printing telegraphy, electric generators, a pole-changer and controlling devices at an exchange station, type-wheel lines in parallel from said communicating instruments, and printing lines in parallel from one electrode of an exchange generator to said instruments, substantially as and for the purposes set forth.

18. In an exchange system of printing telegraphy, alternating devices, arresting devices and electric generators at an exchange or central station, communicating instruments provided respectively with type-wheel printing lines in parallel from said generators through said alternating and arresting devices, relays in the parallel printing circuits, and interrupting devices interposed in a local circuit controlled by said relays and the contacts of said interrupting devices included in the printing circuit and operating by the breaking of a branch printing circuit to momentarily break and close the parallel printing circuits of two communicating instruments, substantially as and for the purposes set forth.

19. In an exchange system of printing telegraphy, electric generators, alternators and arresting devices at an exchange or central station, interrupting devices, relays controlling said devices, communicating printing instruments having type-wheel escapement devices, printing devices, indicating devices and keyboards and type-wheel and printing circuits in parallel from said generators, substantially as and for the purposes set forth.

20. In an exchange system of printing telegraphy, an exchange or central station, printment magnets and devices, printing magnets and devices, indicators and key-boards, typewheel and printing circuits respectively in parallel and converging to terminals at said station, and electric generators, alternating, arresting and interrupting devices located at said station and included in the circuit of said generators and terminals and operatingto coutrol the parallel type-wheel and printing circuits through said instruments, substantially as and for the purposes set forth.

2l. In an exchange system of printing telegraphy, electric generators, alternators, arresting and circuit interrupting devices at an exchange or central station and in multiple arc circuits from said generators, terminals for the printing and type-wheel circuits of the respective alternators and arresting devices and type-wheel and printing lines converging from the respective printing instruments to said exchange or central station, the resistances of said type-wheel and printing lines being balanced to permit of their connection in multiple arc at will to the terminals of different alternators and arresting devices,V

whereby many communicating instruments may be operated in multiple arc from one or more generators, substantially as set forth.

22. The combination of the printing magnet N2, armature w19, armature lever nis, link n, shaft nu, lever 97,23, curved arm 9225, T-lovernSS, shifting-bar n3, pin n3, pallet-levers n4 and a5, guide-box n2, pallet-block N, printing pallet w44, springs n', and means for operating the T-lever, substantially as and for the purposes set forth.

23. The combination, in a printing telegraph, of two type-wheels, a printing pallet disposed between twin springs secured to a block and having portions bent outward around the edges of the paper or tape to allow clearance at each side to permit of the shifting of said block without moving the paper or tape and the said springs bent inward over and above said paperor tape to provide space between their adjacent ends to permit said pallet to pass between said springs while an impression is being effected, and means for actuating said pallet, substantially as set forth.

24E. The combination, in a printing telegraph, of two type-wheels, a printing pallet arranged between twin springs secured to a block so as to leave a clearance or space .between adjacent ends thereof, and means, substantially as described, for shifting said pallet transversely of and into contact with said type-wheels so as to cause said springs moving with said pallet to cover the characters on one of the type-wheels and expose the characters on the other of said wheels, substan tially as and for the purposes set forth.

25. The combination ot' the pallet levers n" and 'm5, guide-box In2 mounted thereon, pallet block N adapted to move freely in said guide-box, shifting bar n3 secured in said pal- IOO let-block, springs n integral with said palletA bar n3, substantially as and for the purposes set forth.

26. In a printing telegraph, a printingblock working in a guide-box provided with spring controlled pins tending to engage said block and prevent accidental movement thereof, substantially as and for the purposes set forth.

27 In a printing telegraph, type-wheels, pallet levers provided with a guide-box, a printing-block movable in said guide-box, means for actuating said block, and spring controlled pins tending to engage recesses in said block to prevent accidental movement thereof, substantially as and for the purposes set forth.

28. In a printing telegraph, type-wheels, pallet-levers provided with a guide-box, a printing block movable in said guide block, springs moving with said block and serving to cover one and expose the other of the typewheels, and spring controlled pins tending to engage recesses in said block to prevent accidental movement thereof, substantially as and for the purposes set forth.

29. The combination of the pallet-lever a5, pawl nl, spring n, ratchet-wheel as, counterpawl a9, counter-ratchet-wheel n10, feed-roller n and pressure-roller at, all operating to feed the paper' tape with a regular intermittent motion, whereby the letters and characters are evenly spaced, substantially as and for the purposes set forth.

30. The combination of the pallet lever ns, pawl nl, spring at", ratchet-wheel ne, counterpawl ng, counter-ratchet-wheel uw and feed roller all, operating to feed the paper tape with a regular intermittent motion whereby the letters and characters are evenly spaced, substantially as and for the purposes set forth.

3l. The combination, in a printing telegraph, of a shaft provided with type-wheels and pins, a printing magnet for operating a shaft provided with an arm, a lever mounted on said arm and adapted to contact with said pins and shift a block provided with springs, a feed-roll provided with ratchet-wheels, a printing pallet lever having a pawl and a counter pawl, the construction and arrangement being such as to respectively rotate and check said feed-roll, and means, as described, for actuating the same, substantially as and for the purposes set forth.

32. In a printing telegraph, a type-wheel shaft provided with type-wheels and pins, a printing magnet for operating a shaft pron vided with a radial arm, a T-lever mounted on said arm and adapted to contact with said pins and shift a rectangular pallet-blocl provided with printing springs, a printing pallet-lever, a feed-roller provided with a ratchet and a counter ratchet-wheel, and a pawl and a counter-pawl carried by the printing pallet lever, the construction and arrangement being such that impressions are effected on a paper tape in either of two parallel lines and from either of the type-wheels, substantially as and for the purposes set forth.

33. In a printing telegraph, a type-wheel shaft 11.40, type-wheels N3 and N4 and pins n and n.42 mounted on said type-wheel shaft, in combination with a printing magnet N2, its armature and lever, a spring controlled shaft n, a link nl?, a lever m28, a lever m38 mounted on a lever p24, a pallet lever, a rectangular shifting pallet-block, a feed-roller, a ratchet and a counter ratchet wheel, a pawl and a counter-pawl, the construction and arrangement being such that impressions on a paper tape are effectedin a straight line from either of said type-wheels, substantially as and for the purposes set forth.

3i. In a printing-telegraph, the pallet-lever p5, pawl nl, spring m45 and counter-pawl a9, in combination with a feed1oller nu provided with a ratchet-wheel Maand a counter ratchetwheel n10, a pressure roller nu, guide-pins n and n3?, and a slotted pin n35, substantially as and for the purposes set forth.

35. The combination, in a printing tclegraph, of a shaft provided with type-wheels and pins, a printing magnet for operating a shaft provided with an arm, a lever mounted on said arm and adapted to contact with said pins and shift a block provided with twin springs, a feed-roll provided with ratchetwheels adapted to be actuated so as to rotate and check said feed-roll, and a slotted pin between said type-wheels and feed roll for guid ing the paper thereto, substantially as and for the purposes set forth.

36. The combination, in a printing telegraph, of two type-Wheels, a printing pallet disposed between twin springs secured to a block so as to leave a clearance between adjacent ends thereof, a feed roll provided with ratchet and counter-ratchet wheels, pins for presenting a paper tape to said printing pallet and a slotted pin for guiding said paper tape to the feed roll, substantially as shown and for the purposes set forth.

37. The combination, in a printing telegraph, of type-wheels, a printing pallet arranged beneath twin springs secured to a block connected with a shifting lever, means substantially as described, for actuating said lever and block, a feed roll provided with ratchet-wheels, pins for presenting a paper tape to the printing pallet, a slotted pin for guiding said paper' tape to the feed roll and means, substantially as described, for actuat ing said feed roll, substantially as and for the purposes set forth.

3S. In a printing telegraph, a guide-box n2, mounted on pallet levers at and n, in combination with the pallet block N, secured to the shifting-bar n3, the printing pallet '1144 integral with said pallet bloclr N, the retaining IOO IIO

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springs w32 secured to the guide-box n2, pins n30 and ns1 attached to said springs and tending to engage the indentations m33 and 1134 in the pallet-block N, and the curved-springs u secured to said pallet block and passing ovei` the paper tape N', the extremities of the springs n being separated for a distance equal to or greater than the thickness of the face of the type-Wheels N 3 and N4 to permit 1o of the taking of impressions from either type- Wheel, substantially as and for the purposes set forth.

In testimonywhereof we have hereunto set oui` signatures in the presence of two subscribing Witnesses.

SAMUEL RUSH LINVILLE. LOUIS FREDERICK HETTMANSPERGER.

Witnesses:

THOMAS M. SMITH, RICHARD C. MAXWELL. 

